<!--
  Copyright (c) 2006-2013, JGraph Ltd
  
  Shape example for mxGraph. This example demonstrates how to
  implement and use a custom shape.
-->
<html>
<head>
	<title>Shape example for mxGraph</title>

	<!-- Sets the basepath for the library if not in same directory -->
	<script type="text/javascript">
		mxBasePath = '../src';
	</script>

	<!-- Loads and initializes the library -->
	<script type="text/javascript" src="../src/js/mxClient.js"></script>

	<!-- Example custom shape -->
	<script type="text/javascript">
	
		/*
			The example shape is a "3D box" that looks like this:
		               ____
		              /   /|
		             /___/ |
		             |   | /
		             |___|/
		                      
		   	The code below defines the shape. The BoxShape function
		   	it the constructor which creates a new object instance.
		*/
		function BoxShape()
		{
			mxCylinder.call(this);
		};

		/*
		   	The next lines use an mxCylinder instance to augment the
		   	prototype of the shape ("inheritance") and reset the
		   	constructor to the topmost function of the c'tor chain.
		*/
		mxUtils.extend(BoxShape, mxCylinder);
		
		// Defines the extrusion of the box as a "static class variable"
		BoxShape.prototype.extrude = 10;
			
		/*
		   	Next, the mxCylinder's redrawPath method is "overridden".
		   	This method has a isForeground argument to separate two
		   	paths, one for the background (which must be closed and
		   	might be filled) and one for the foreground, which is
		   	just a stroke.

		     Foreground:       /
		                 _____/
		                      |
		                      |
		                   ____  
		     Background:  /    | 
		                 /     | 
		                 |     / 
		                 |____/ 
		*/
		BoxShape.prototype.redrawPath = function(path, x, y, w, h, isForeground)
		{
			var dy = this.extrude * this.scale;
			var dx = this.extrude * this.scale;

			if (isForeground)
			{
				path.moveTo(0, dy);
				path.lineTo(w - dx, dy);
				path.lineTo(w, 0);
				path.moveTo(w - dx, dy);
				path.lineTo(w - dx, h);
			}
			else
			{
				path.moveTo(0, dy);
				path.lineTo(dx, 0);
				path.lineTo(w, 0);
				path.lineTo(w, h - dy);
				path.lineTo(w - dx, h);
				path.lineTo(0, h);
				path.lineTo(0, dy);
				path.lineTo(dx, 0);
				path.close();
			}
		};
		
		mxCellRenderer.registerShape('box', BoxShape);
	</script>

	<!-- Example code -->
	<script type="text/javascript">

		// Program starts here. Creates a sample graph in the
		// DOM node with the specified ID. This function is invoked
		// from the onLoad event handler of the document (see below).
		function main(container)
		{
			// Checks if browser is supported
			if (!mxClient.isBrowserSupported())
			{
				// Displays an error message if the browser is
				// not supported.
				mxUtils.error('Browser is not supported!', 200, false);
			}
			else
			{
				// Creates the graph inside the DOM node.
				var graph = new mxGraph(container);
				
				// Disables basic selection and cell handling
				graph.setEnabled(false);

				// Changes the default style for vertices "in-place"
				// to use the custom shape.
				var style = graph.getStylesheet().getDefaultVertexStyle();
				style[mxConstants.STYLE_SHAPE] = 'box';
				
				// Adds a spacing for the label that matches the
				// extrusion size
				style[mxConstants.STYLE_SPACING_TOP] = BoxShape.prototype.extrude;
				style[mxConstants.STYLE_SPACING_RIGHT] = BoxShape.prototype.extrude;
				
				// Adds a gradient and shadow to improve the user experience
				style[mxConstants.STYLE_GRADIENTCOLOR] = '#FFFFFF';
				style[mxConstants.STYLE_SHADOW] = true;

				// Gets the default parent for inserting new cells. This
				// is normally the first child of the root (ie. layer 0).
				var parent = graph.getDefaultParent();
								
				// Adds cells to the model in a single step
				graph.getModel().beginUpdate();
				try
				{
					var v1 = graph.insertVertex(parent, null, 'Custom', 20, 20, 80, 60);
					var v2 = graph.insertVertex(parent, null, 'Shape', 200, 150, 80, 60);
					var e1 = graph.insertEdge(parent, null, '', v1, v2);
				}
				finally
				{
					// Updates the display
					graph.getModel().endUpdate();
				}
			}
		};
	</script>
</head>

<!-- Page passes the container for the graph to the program -->
<body onload="main(document.getElementById('graphContainer'))">

	<!-- Creates a container for the graph with a grid wallpaper -->
	<div id="graphContainer"
		style="overflow:hidden;width:321px;height:241px;background:url('editors/images/grid.gif')">
	</div>
</body>
</html>
